Tar-drag.



s. B. SHELDON.

IAR DRAG.

APPLICATION HLED m. I. 1915. 1 168 57. Patented Jan.- 18, 1916.

s. B. SHELDON.

Patented J an '2 SHEETS-SHEET 2.

SAMUEL 1B. SHELDON, OF DULUTH, ESDTA.

ran-Dues.

Specificatioh of Letters Patent.

Patented Jan. 18, T1916.

hpiolicetion filed April 1, 1915. Serial No. 18,535.

To all whom may C02Z06?'i?/ Be- It; known that l, SAMUEL B. Srmwon,

' a. citizen of the United States, and resident of Duluth, in the countyor" St. Louis and State of Minnesota, have. invented certain new d.useful lrnprovhments in Tar DragS, of which theiollowlng 18 aspecification.

My invention relates to lay-product coke ovens and has particularreference to anove'l nieans heavy tar in preventing the accumulation ofthe mains leading from. the ovens. v 1

In the operation of icy-product coke ovens the gas first liberated fromthe coal contains a quantity of tar and heavy hydrocarbons. The gas iscollected in mains'located over the ovens and a large preportion of thetar condenses and accumulates in the'bottom of the main and is oh bysuitable means. in practice a 'heavy pitch gathers in the main which isvery diflicult to remove and which will cause obstruction if allowed toremain. Poke-holes. have I been provided through which bars or spoons.can be inserted to prevent this accumulation and obstruction. This is alaborious and inefficient means for overcomin'g'the trouble.

An object in the'present invention is to provide a drag or scraper Whichshall be adapted to be reciprocated slowly from end to end of a gas mainwhereby to preventthe accumulation of the pitch referred. to and causeit topass away with themore fluid tar. This pitch isa very tough substance and tends to adhere tenaciously to the hottoni oi the mains;therefore a drag for loosening this substance must be heavy and strongandbe operated with. suiiicient force to cause 1t to thoroughly scrape:the male Elli from end to end.

The niventifbn Wlll he more readily .un derstood by reference to theaccompanying drawin s. wherein.

Figure 1 a longitudinal section-through the mechanism located at one endof a main; Fig". 2 is a similar view showing the opposite end of themain, and, 3 is a section on the line 3-3 of Fig. 1.

in the drawings a gas main is indicated at 10; .At one end of the main,as showniin 1 I mount a. trough 11, which acts as a tar well or seal forthe ,end of the gas main, which end is partially closed by the removablecover 12, leaving a. space-13, therebeneath, through which the tar dragin casing above the trough 11, are a pair of drums l4, l5, hoth'oztWhichare shown as driven through the medium of a pinion. 16, connectedby suitable ge'aringto a motor 17. A driving cable 18, passes over thedrums M 15, and around a'pair of idlers 1i, looselymounted. on a shaft20, these idlers of course rotating in opposite directions. Mounted onthe bottom of the main 10 is a flanged guidingmeniher 21. as best shownin Fig. 3, the flanges 22, oi? which serve to retain in place and guideadrag 23. One end of the cable 18, is attached to the drag at 24, thecahle'thence passing around one of the idlers 19, the driving drums,then returning around the second idler and extending along the bottom ofthe main in the channel of the member 21, the portion of the cable thusutilized heingindicated at 25, in Fig. 3. This cable 25, is shownin Fig.2, as extending around anddler 26,

main is substantially a duplication of that shown in Fig. l.

Mounted at the limit of the travel of the drag at either end of the mainis a lever 33, having a counter-weight 3d, therein this lever beingconnected" to any suitable reversing-mechanism whereby the direction ofmovement of the prime mover may he changed. in the case of the motorshown the shaft of the lever 33, will he connected to a reversingswitch. In the case of a steam engine of course the shaft will beconnected to a reversing valve.

' in operation the treugh ii, and the lower part of the main 10., willcontain tar to substantially the height indicated by the line 35, thussealing the main against the escape of gas. The motor being started in.operation, the drag 23, Will be caused to move slowly from end to end ofthe main, the direction of movement being reversed when tut) combinationof a gas main having a curved substantially as described.

\the drag reaches the end and contacts one of the arms33. The guideformed in the bottom of the main rigidly holds the drag in properrelation and at the same time. provides for the return'of the cablewhich may by this means be made endless instead of being wound upon adrum at each end of the main. The installation shown is simplified andit will be understood that in practice the same driving mechanism may beemployed for dragging two or more adjacent gas mains by interconnectingthe cables from the driving shafts.

I claim: v e

1. In a device of the class described, the combination of a gas main, anangular guide rigidly secured to the interior of said main, a dragadapted to be guided and limited in vertical and lateral movementthereby, and means for moving said drag and reversing the direction ofmovement thereof,

2. In a device of the class described, the

lower Wall, an angular guide extending from end to end of the main, adrag, the lower portion of which is shaped to correspond to the shape ofthe lower wall of the main, said drag being guided and limited invertical and lateral movement by said ansaid drag, substantially asdescribed.

3. In a device of the class described, the

combination of a gas main having partially open ends,.tar seals providedfor said par tially open ends, a tar drag reciprocable in said main, anangular guide adapted to limit the verticaland lateral movement of thedrag and an endless element connected to said drag and a prime mover andadapted to cause the reciprocation of said drag, sub stantially asdescribed.

4C. In a device of the class described, the combination of a gas main, aguiding member providing an open space therein, a tar drag reciprocableon said guiding member, said drag being limited in it s.movement andcaused to travel in a substantially fixed path by cooperation with saidguiding member, and an endless cable connected to said drag, the returnportion of said cable 0ccupying the space in said guiding member,

substantially as described.

Signed at Duluth, St. Louis county, Min.-

nesota, this 29 day of Mch., 1915.

SAMUEL B. SHELDON.

Witnesses: J. E. CARLSON,

EDWARb H. NINDQN.

